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Published: 13 June 2018

The on_get_missing_events function in handlers/ in Matrix Synapse before 0.31.1 has a security bug in the get_missing_events federation API where event visibility rules were not applied correctly.



Cvss 3 Severity Score


Score breakdown


Package Release Status
Launchpad, Ubuntu, Debian
artful Ignored
(end of life)
Released (0.24.0+dfsg-1ubuntu0.1~esm1)
Available with Ubuntu Pro
cosmic Ignored
(end of life)
trusty Does not exist

upstream Needs triage

xenial Does not exist

disco Ignored
(end of life)
eoan Ignored
(end of life)
focal Not vulnerable
hirsute Ignored
(end of life)
jammy Not vulnerable
lunar Not vulnerable
groovy Ignored
(end of life)
impish Ignored
(end of life)
kinetic Not vulnerable
mantic Needs triage

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N